I too have an M1 and in no way do I consider it dark or leaning towards dark. The only way I would call it dark is in comparison with some gear that are, to my ears, way too bright.
My M1 was updated to the MDX board in 2020 (and I've not heard the M3)
Might I ask those who have an M1 or M3, how you're feeding the DAC? I've just got a used M1se with the MDX update and Ethernet and I'm swimming in indecisiveness. My existing setup just plays Bitperfect/iTunes from my laptop w/ my 3TB library on a portable external HD, through Airplay to an Airport that connects to my existing DAC via mini Toslink... but I want to upgrade now that I'm switching my DAC to the M1.
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